Finding the Fourth Proportional to 171,624.84, 257,364.30 and 78,189.96

Step by Step Solution

1. Step 1: Write the proportion equation
   171,624.84 : 257,364.30 = 78,189.96 : x
2. Step 2: Convert to fraction form
   171,624.84/257,364.30 = 78,189.96/x
3. Step 3: Cross multiply
   171,624.84x = 257,364.30 × 78,189.96
4. Step 4: Simplify right side
   171,624.84x = 20,123,304,322.43
5. Step 5: Solve for x
   x = 20,123,304,322.43/171,624.84
6. Step 6: Final answer
   x = 117,251.70